A hypothetical element has two main isotopes. One has a mass of "40 amu" and the other has a mass of 42 amu. If the atomic weight of this element is 40.78 amu, what is the percent abundance of the 42 amu isotope?

the dependant variable is spilled water

the independent is the heat

it is b that is the answer.

football

explanation:

because it is

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.